Annual report pursuant to Section 13 and 15(d)

Unsecured Lines of Credit Payable - Recognized Interest Expense (Details)

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Unsecured Lines of Credit Payable - Recognized Interest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]      
Interest expense (excluding facility fees) $ 6,554 $ 6,843 $ 3,857
Facility fees $ 1,400 $ 1,371 $ 1,217